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Quarter of Wolfram Alpha brainteasers come from Siri • The Register - http://www.theregister.co.uk/2012/02/08/siri_wolfram/
"The robot-loving physicist (who once said that all science needed to know could be found by studying the behaviour of cellular automata) launched the knowledgable super-brain in 2009. Wolfram's threat to knock Google down a peg or two was mocked at the time, our Reg reviewer declaring the web service a tool primarily for boffins. However, the computation engine has been tweaked and is now a fundamental part of Siri, helping fanboys who whisper sweet nothings into their iPhone 4Ss get intelligent responses." ‎- silpol